Insider attacks on Afghan and U.S. forces are a common method of attack in Afghanistan. “I think the signature attack that we’re beginning to see the– is going to be the insider attack,” then-Commander of all U.S. forces in Afghanistan Gen. John Allen told “60 Minutes” in 2012.

Two U.S. citizens, one a soldier the other a contractor, were shot dead in a similar insider attack in October 2016 in the city of Kabul.

The U.S. will be deploying nearly 300 Marines to Helmand province, which is increasingly under Taliban control. The U.S. mission in Afghanistan is to train advise and assist Afghan Security Forces.

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